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    <title>Pie Chart &#124; the D3 Graph Gallery</title>

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        <h1>Pie chart</h1>
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        <p style="max-width: 700px; margin: auto">
          This is the
          <a href="https://www.data-to-viz.com/caveat/pie.html">pie chart</a>
          section of the gallery. The pie chart is highly criticized in dataviz
          for meaningful reasons. You should
          <a href="https://www.data-to-viz.com/caveat/pie.html"
            >read more about that</a
          >
          before making one.If you're sure about what you're doing, learn how to
          build one with d3.js using the examples below.
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        <div class="mySeryTitle">Note</div>
        <hr />
        <p>
          It is of interest to note that pie chart and
          <a href="donut.html">donut chart</a> are built using exactly the same
          process in d3.js. Thus, you probably want to visit the
          <a href="donut.html">donut section</a> for more examples
        </p>
        <a class="btn btn-secondary btn-md text-uppercase" href="donut.html"
          >Donut chart section</a
        >

        <br /><br /><br /><br />
        <div class="mySeryTitle">Step by step</div>
        <hr />
        <p>
          Building a pie chart in d3.js always start by using the
          <code>d3.pie()</code> function. This function transform the
          <u>value</u> of each group to a <u>radius</u> that will be displayed
          on the chart. This radius is then provided to the
          <a href="graph/shape.html#myarc">d3.arc()</a> function that draws on
          arc per group.
        </p>
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            <a class="portfolio-link" href="graph/pie_basic.html">
              <div class="portfolio-hover">
                <div class="portfolio-hover-content">
                  <p>Most basic</p>
                  <hr />
                  <p class="explanation_portfolio">
                    The most basic pie chart you can do in d3.js. Keeping only
                    the core code.
                  </p>
                </div>
              </div>
              <img class="img-fluid" src="img/graph/pie_basic.png" alt="" />
            </a>
          </div>
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            <a class="portfolio-link" href="graph/pie_annotation.html">
              <div class="portfolio-hover">
                <div class="portfolio-hover-content">
                  <p>Add annotation</p>
                  <hr />
                  <p class="explanation_portfolio">
                    How to use the centroid() function to add labels at the
                    right position of each slice.
                  </p>
                </div>
              </div>
              <img
                class="img-fluid"
                src="img/graph/pie_annotation.png"
                alt=""
              />
            </a>
          </div>
          <div class="col-md-4 col-sm-6 portfolio-item">
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                <div class="portfolio-hover-content">
                  <p>Data input selection</p>
                  <hr />
                  <p class="explanation_portfolio">
                    Have a smooth transition between 2 datasets. Note that the
                    number of group can even be different from one dataset to
                    the other.
                  </p>
                </div>
              </div>
              <img
                class="img-fluid"
                src="img/graph/pie_changeData.gif"
                alt="a pie chart with input data selector"
              />
            </a>
          </div>
        </div>

        <br /><br /><br /><br />
        <div class="mySeryTitle">Selection of blocks</div>
        <hr />
        <p>
          A selection of examples showing the application of the basic concept
          to real life dataset.
        </p>
        <div id="portfolio-items" class="row">
          <div class="col-md-4 col-sm-6 portfolio-item">
            <a
              class="portfolio-link"
              href="https://beta.observablehq.com/@mbostock/d3-pie-chart"
            >
              <div class="portfolio-hover">
                <div class="portfolio-hover-content">
                  <p>Pie chart with annotation</p>
                  <hr />
                  <p class="explanation_portfolio">
                    A pie chart by Mike Bostock with fancy annotation for each
                    group.
                  </p>
                </div>
              </div>
              <img
                class="img-fluid showBlock"
                src="img/block/block_pieChart.png"
                alt="network graph les miserables"
              />
            </a>
          </div>
          <div class="col-md-4 col-sm-6 portfolio-item">
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                <div class="portfolio-hover-content">
                  <p>Clean layout</p>
                  <hr />
                  <p class="explanation_portfolio">
                    Clean labeling of groups. Use d3 v3 though.
                  </p>
                </div>
              </div>
              <img
                class="img-fluid showBlock"
                src="img/block/block_pieChartAnimation.png"
                alt="network graph les miserables"
              />
            </a>
          </div>
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              class="portfolio-link"
              href="https://bl.ocks.org/tezzutezzu/c2653d42ffb4ecc01ffe2d6c97b2ee5e"
            >
              <div class="portfolio-hover">
                <div class="portfolio-hover-content">
                  <p>Pie chart with animation</p>
                  <hr />
                  <p class="explanation_portfolio">
                    Good illustration on how to animate transition between 2
                    input data.
                  </p>
                </div>
              </div>
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            <div class="captionPortfolio">Pie chart</div>
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